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DOI | 10.1029/2018GL077252 |
Dynamic Response of a High Arctic Glacier to Melt and Runoff Variations | |
van Pelt, Ward J. J.1; Pohjola, Veijo A.1; Pettersson, Rickard1; Ehwald, Lena E.1; Reijmer, Carleen H.2; Boot, Wim2; Jakobs, Constantijn L.2 | |
2018-05-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:10页码:4917-4926 |
文章类型 | Article |
语种 | 英语 |
国家 | Sweden; Netherlands |
英文摘要 | The dynamic response of High Arctic glaciers to increased runoff in a warming climate remains poorly understood. We analyze a 10-year record of continuous velocity data collected at multiple sites on Nordenskioldbreen, Svalbard, and study the connection between ice flow and runoff within and between seasons. During the melt season, the sensitivity of ice motion to runoff at sites in the ablation and lower accumulation zone drops by a factor of 3 when cumulative runoff exceeds a local threshold, which is likely associated with a transition from inefficient (distributed) to efficient (channelized) drainage. Average summer (June-August) velocities are found to increase with summer ablation, while subsequent fall (September-November) velocities decrease. Spring (March-May) velocities are largely insensitive to summer ablation, which suggests a short-lived impact of summer melt on ice flow during the cold season. The net impact of summer ablation on annual velocities is found to be insignificant. Plain Language Summary A major uncertainty in future predictions of glacier mass loss, and the corresponding sea level rise contribution, stems from a lack of understanding of potential feedbacks between surface melt and ice motion. Melt water penetrating to the bed of a glacier facilitates fast ice motion through sliding. Whether increased melt water input induces a net long-term acceleration or deceleration of ice flow however critically depends on the interaction between melt input and transience of the subglacial drainage system at both intraseasonal and interseasonal time scales. To assess this, long-term data sets of ice motion and runoff are essential. In this study, a 10-year record of continuous velocity data, collected at multiple sites on Nordenskioldbreen in Svalbard, is presented and compared to simulated runoff. We find that the sensitivity of summer velocities to runoff drops by a factor of 3 after a runoff-induced change of drainage system morphology. While average summer motion increases with ablation, fall (September-November) motion decreases, and spring (March-May) motion appears largely insensitive to summer melt. Altogether, the net impact of increased summer melt on annual velocities is found to be negligible. |
英文关键词 | glacier dynamics runoff climate change High Arctic |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000435262000043 |
WOS关键词 | GREENLAND ICE-SHEET ; POLYTHERMAL VALLEY GLACIER ; SUBGLACIAL DRAINAGE ; TIDEWATER GLACIER ; SEASONAL-CHANGES ; ABLATION AREA ; SURFACE MELT ; SUMMER MELT ; SVALBARD ; MODEL |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25585 |
专题 | 气候变化 |
作者单位 | 1.Uppsala Univ, Dept Earth Sci, Uppsala, Sweden; 2.Univ Utrecht, Inst Marine & Atmospher Res Utrecht, Utrecht, Netherlands |
推荐引用方式 GB/T 7714 | van Pelt, Ward J. J.,Pohjola, Veijo A.,Pettersson, Rickard,et al. Dynamic Response of a High Arctic Glacier to Melt and Runoff Variations[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(10):4917-4926. |
APA | van Pelt, Ward J. J..,Pohjola, Veijo A..,Pettersson, Rickard.,Ehwald, Lena E..,Reijmer, Carleen H..,...&Jakobs, Constantijn L..(2018).Dynamic Response of a High Arctic Glacier to Melt and Runoff Variations.GEOPHYSICAL RESEARCH LETTERS,45(10),4917-4926. |
MLA | van Pelt, Ward J. J.,et al."Dynamic Response of a High Arctic Glacier to Melt and Runoff Variations".GEOPHYSICAL RESEARCH LETTERS 45.10(2018):4917-4926. |
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